diff --git a/deps/oblib/src/lib/ob_define.h b/deps/oblib/src/lib/ob_define.h
index f1dacca69a..493c88bbaa 100644
--- a/deps/oblib/src/lib/ob_define.h
+++ b/deps/oblib/src/lib/ob_define.h
@@ -224,7 +224,6 @@ const int64_t OB_MAX_VIEW_COLUMN_NAME_LENGTH_MYSQL  = 64;
 const int64_t OB_MAX_COLUMN_NAME_LENGTH = 128; // Compatible with oracle, OB code logic is greater than Times TODO:xiyu
 const int64_t OB_MAX_COLUMN_NAME_BUF_LENGTH = OB_MAX_COLUMN_NAME_LENGTH + 1;
 const int64_t OB_MAX_COLUMN_NAMES_LENGTH = 2 * 1024;
-const int64_t OB_MAX_COLUMN_GROUP_NAME_LENGTH = 256; // need to larger than max_column_name_length
 const int64_t OB_MAX_APP_NAME_LENGTH = 128;
 const int64_t OB_MAX_OPERATOR_PROPERTY_LENGTH = 4 * 1024;
 const int64_t OB_MAX_DATA_SOURCE_NAME_LENGTH = 128;
@@ -831,7 +830,8 @@ const uint64_t INVALID_COLUMN_GROUP_ID = 0;
 const uint64_t DEFAULT_TYPE_COLUMN_GROUP_ID = 1; // reserve 2~999
 const uint64_t COLUMN_GROUP_START_ID = 1000;
 const uint64_t DEFAULT_CUSTOMIZED_CG_NUM = 2;
-
+const int64_t OB_CG_NAME_PREFIX_LENGTH = 5; // length of cg prefix like "__cg_"
+const int64_t OB_MAX_COLUMN_GROUP_NAME_LENGTH = OB_MAX_COLUMN_NAME_LENGTH * OB_MAX_CHAR_LEN + OB_CG_NAME_PREFIX_LENGTH; //(max_column_name_length(128) * ob_max_char_len(3)) + prefix
 //Oracle
 const int64_t MAX_ORACLE_COMMENT_LENGTH = 4000;
 
diff --git a/src/share/schema/ob_column_schema.cpp b/src/share/schema/ob_column_schema.cpp
index 19f82b12e7..4a87026653 100644
--- a/src/share/schema/ob_column_schema.cpp
+++ b/src/share/schema/ob_column_schema.cpp
@@ -807,9 +807,13 @@ int ObColumnSchemaV2::get_each_column_group_name(ObString &cg_name) const {
   int32_t write_len = snprintf(tmp_cg_name, OB_MAX_COLUMN_GROUP_NAME_LENGTH, "%.*s_%.*s",
                                static_cast<int>(sizeof(OB_COLUMN_GROUP_NAME_PREFIX)),
                                OB_COLUMN_GROUP_NAME_PREFIX, column_name_.length(), column_name_.ptr());
-  if (write_len < 0 || write_len >= OB_MAX_COLUMN_GROUP_NAME_LENGTH) {
+  if (write_len < 0) {
     ret = OB_ERR_UNEXPECTED;
     LOG_WARN("fail to format column group_name", K(ret), K(write_len));
+  } else if (write_len > OB_MAX_COLUMN_GROUP_NAME_LENGTH) {
+    ret = OB_ERR_TOO_LONG_IDENT;
+    LOG_WARN("too long column name to format column group name", K(ret), KPC(this), K(write_len));
+    LOG_USER_ERROR(OB_ERR_TOO_LONG_IDENT, column_name_.length(), column_name_.ptr());
   }
 
   if (OB_SUCC(ret)) {
diff --git a/tools/deploy/mysql_test/test_suite/inner_table/r/mysql/desc_virtual_table_in_mysql.result b/tools/deploy/mysql_test/test_suite/inner_table/r/mysql/desc_virtual_table_in_mysql.result
index cdfeca4d59..19f7b69791 100644
--- a/tools/deploy/mysql_test/test_suite/inner_table/r/mysql/desc_virtual_table_in_mysql.result
+++ b/tools/deploy/mysql_test/test_suite/inner_table/r/mysql/desc_virtual_table_in_mysql.result
@@ -4519,7 +4519,7 @@ schema_version	bigint(20)	NO	PRI	NULL
 gmt_create	timestamp(6)	NO		NULL	
 gmt_modified	timestamp(6)	NO		NULL	
 is_deleted	bigint(20)	NO		NULL	
-column_group_name	varchar(256)	YES			
+column_group_name	varchar(389)	YES			
 column_group_type	bigint(20)	YES		NULL	
 block_size	bigint(20)	YES		NULL	
 compressor_type	bigint(20)	YES		NULL	
diff --git a/tools/deploy/mysql_test/test_suite/inner_table/r/mysql/desc_virtual_table_in_sys.result b/tools/deploy/mysql_test/test_suite/inner_table/r/mysql/desc_virtual_table_in_sys.result
index d0ab7c96a7..66687f4892 100644
--- a/tools/deploy/mysql_test/test_suite/inner_table/r/mysql/desc_virtual_table_in_sys.result
+++ b/tools/deploy/mysql_test/test_suite/inner_table/r/mysql/desc_virtual_table_in_sys.result
@@ -8224,7 +8224,7 @@ table_id	bigint(20)	NO	PRI	NULL
 column_group_id	bigint(20)	NO	PRI	NULL	
 gmt_create	timestamp(6)	NO		NULL	
 gmt_modified	timestamp(6)	NO		NULL	
-column_group_name	varchar(256)	NO			
+column_group_name	varchar(389)	NO			
 column_group_type	bigint(20)	NO		NULL	
 block_size	bigint(20)	NO		NULL	
 compressor_type	bigint(20)	NO		NULL	
@@ -8882,7 +8882,7 @@ schema_version	bigint(20)	NO	PRI	NULL
 gmt_create	timestamp(6)	NO		NULL	
 gmt_modified	timestamp(6)	NO		NULL	
 is_deleted	bigint(20)	NO		NULL	
-column_group_name	varchar(256)	YES			
+column_group_name	varchar(389)	YES			
 column_group_type	bigint(20)	YES		NULL	
 block_size	bigint(20)	YES		NULL	
 compressor_type	bigint(20)	YES		NULL